Multiple line replace jQuery textarea

I have a question with the following script, apparently works well when a line of code, but if to replace several lines of code does not work :(

A line of code:

Multiple lines of code

When the result should be:

http://www.domain.com/myimages/123/123_small.jpg
http://www.domain.com/myimages/456/456_small.jpg
http://www.domain.com/myimages/789/789_small.jpg

JSFIDDLE:

http://jsfiddle.net/mxk6fLpg/

<h3>Enter:</h3>

<textarea value="" id="enter"></textarea>
<h3>Result:</h3>

<textarea class="disable" id="result"></textarea><br />
<input type="reset" value="Resetear" class="button reset" />

$('#enter').keyup(function () {
    var url = 'http://www.domain.com/myimages/' + $(this).val() + '/' + $(this).val() + '_small.jpg';
    var result = url;
    $('#result').html(result);
});